Munchkin MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller Part 6. START-UP Procedures

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START-UP PROCEDURES

PART 6. START-UP PROCEDURES

A.SEQUENCE OF OPERATION

1.When power is first applied to the control, the control display will read the outlet tempera- ture. The control will initially run through a self-diagnostic routine and then go into its oper- ating mode. If there is no call for heat, the System will go into an idle state.

2.If the thermostat is calling for heat, the control will apply power to the circulator pump. If the control determines the water temperature is below the programmed set point value minus the switching differential, the control will initiate a heating cycle.

3.The control then performs selected system diagnostic checks. If all checks are successfully passed, a pre-purge cycle is initiated (the blower will be on maximum speed).

4.When the pre-purge period is complete, power is applied to the spark ignitor for approxi- mately 6 seconds. Approximately 2 seconds later, we verify flame. If a flame is not verified during the trial-for-ignition, the gas valve is immediately closed and the control will return to step. After three trials, if a flame is not verified, the control will go into a lockout mode. If a flame is confirmed, the control enters the heating mode. The fire rate will be based on the proprietary algorithm.

5.When water temperature reaches the temperature set point value plus 10 degrees F (or if the thermostat call-for-heat is satisfied), the gas valve is closed and the control enters a post- purge state (the blower will be on maximum speed). NOTE: If the thermostat is still calling for heat, the circulator pump will continue to run until the thermostat call for heat is satis- fied.

6.When the post-purge is complete, the control enters an idle state while continuing to moni- tor temperature and the state of other system devices. If a call-for-heat is received, the con- trol will automatically return to step 2 in sequence and repeat the entire operating cycle.

During the idle state and heat state, if the control detects an improper operating state from external devices, such as the high-limit switch, the red light on the control will illuminate an error code will appear in the display.

B. ITEMS TO BE CHECKED BEFORE LIGHTING THE MUNCHKIN

It is recommended that you read the General Information Section (Part 1) to get a better under- standing how the Munchkin operates before you start the unit.

1.Make sure that you follow the Lighting instruction before running the Munchkin.

2.Make sure the unit has a minimum water supply pressure of 10 PSI or a fault code of PrO will appear in the display. While this Fault code is on the display the unit will not operate unit until the water pressure is brought above 10 PSI. This Fault code is caused by the Water pressure switch being open for more than 5 seconds which is an indication your system pressure is below 10 PSI. Increase the water pressure in the system until the pressure gauge reads 10psi. This code will disappear once the Water Pressure switch is closed, which will allow you to start the Munchkin.

3.Check to see if all the electrical connections are on securely.

4.Make sure that the Gas is turned on inside the cabinet and outside of the Munchkin.

5.Double check the temperature setting (Note: The Munchkin is factory set at 180 degrees)

6.Make sure the unit is properly grounded and the electrical wiring meets the requirements of the electrical section (Part 2).

7.Turn on the power to the Munchkin. The Temperature of the Munchkin Outlet will appear in the display provided. If a fault code appears, correct the fault before operating. Make sure that

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Contents Munchkin High Efficiency Heater With the 925 ControllerUsing this Manual Special Attention BoxesTable of Contents Part 1. General Information Munchkin Ratings and DimensionsHOW IT Operates Recommended Service Clearances Dimensions 80M 140M/199M PRE-INSTALLATION Requirement GeneralPressure Relief Valve Part 2. ElectricalElectrical Connection Electrical Connection Wiring Directly to Central Heating Circulator GAS Piping Part 3. GAS ConnectionGAS Connection GAS TableDungs GAS Valve Part 4. Venting Approved Venting MaterialsVenting the Munchkin Direct vent terminal clearance Minimum clearance, C Longer Vent Runs Vented ApplianceHeater Removal from a Common Vent System Condensate RemovalDiagrams for Sidewall Venting Venting Diagrams for Vertical Venting Part 5. Piping Hydronic Piping with Circulators or Zone ValvesCirculator Sizing Munchkin T50M Munchkin T80M/80M Munchkin 140M Munchkin 199MFill and Purge Heating System Piping Symbol Legend Piping IllustrationsOFF Zone valves Piping Zone valves Make-up water Piping Space heating zone circuit Zone Circulators Make-up water PB1 PB2 PB1 PB2 Sequence of Operation Part 6. START-UP ProceduresItems to be Checked Before Lighting the Munchkin Lighting Instructions Operating InstructionsAdjusting the Temperature on the Munchkin Display Status MenuTest Mode To Turn OFF GAS to AppliancePart 7. Troubleshooting Munchkin Error Code925 Control Board Error Codes Resistance Tables Condensate Cleaning Instructions Part 8. MaintenanceMaintenance Procedures Before Each Heating SeasonMaintenance Control Wiring Layout Munchkin ControllerMaintenance Maintenance Page Page Munchkin R1

MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller specifications

The Munchkin High Efficiency Heater, equipped with the advanced "925" Controller, represents a significant advancement in heating technology for both residential and commercial applications. Known for its reliability and exceptional performance, this heater is designed to provide efficient heating while minimizing energy costs and environmental impact.

The Munchkin High Efficiency Heater operates on a condensing technology that extracts heat from exhaust gases. This process allows for higher efficiency rates, often exceeding 95%. By recovering heat that would otherwise be lost, the heater maximizes energy utilization, making it an eco-friendly choice for homeowners and businesses alike.

One of the standout features of the Munchkin 925 Controller is its user-friendly interface, which allows for effortless operation and monitoring of the heating system. The controller comes with advanced diagnostic capabilities that provide real-time feedback on system performance. Users can easily adjust settings, program schedules, and monitor energy consumption, ensuring optimal comfort and efficiency.

Furthermore, the Munchkin High Efficiency Heater is equipped with a variety of features that enhance its performance and user experience. The unit is designed with a durable heat exchanger made from stainless steel, which not only improves heat transfer but also ensures longevity and resistance to corrosion.

The heater operates quietly, making it suitable for installation in residential settings, including bedrooms and living spaces. Additionally, its compact design allows for flexible installation options, even in constrained spaces. The Munchkin unit is also compatible with multiple venting options, providing further versatility in installation configuration.

Safety features are a priority in the design of the Munchkin Heater. It includes built-in freeze protection, ensuring that the system operates effectively even in low temperatures. The unit also has an array of safety sensors that monitor for conditions such as flue blockage and overheating, triggering automatic shut-off mechanisms to prevent potential hazards.

In conclusion, the Munchkin High Efficiency Heater with the "925" Controller is a cutting-edge solution for efficient heating. With its superior performance, advanced controller system, durable construction, and comprehensive safety features, it remains a top choice for those looking to improve their heating efficiency while reducing energy consumption. Whether it's for residential or commercial use, the Munchkin heater promises reliability and comfort in any environment.
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